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> Retracting Caliper Pistons, How to?
post Feb 25, 2008 - 1:14 PM
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Vince-Noir



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My new rear discs are on and the calipers are off waiting for me to retract the pistons before i replace the pads, but i have no idea how to retract the pistons on my 98 GT (3SGE). frown.gif In fact they look fully extended!

Can anyone tell me how to do this please?

Many thanks wink.gif
 
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post Feb 25, 2008 - 7:56 PM
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alltracman78



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Two problems.

1-When you pushed the piston back in, if brake fluid leaked out past the piston, the piston seal is leaking.
It might or might not leak when the caliper is back on the car and you use the brakes.
If it does leak, you won't have much braking force at all.

2-You left the cap off the master cylinder, which pretty much means ALL your brake fluid is junk.
This is why:
Your brakes get really hot when you use them. The harder you brake the hotter they get. This heats up the brake fluid in the line a lot. Brake fluid is designed with a very high boiling point [tells you on the bottle of fluid] so it won't boil from the heat. If it boils, you lose braking force.
Water on the other hand boils at a relatively cool 212*F.
What does water have to do with brake fluid?
Brake fluid absorbs water. Really bad.
Imagine the brake fluid is Michael Jackson and the water is a cute 8 yr old boy. It can't stay away.

So, while the brake fluid might not boil when you brake hard, the water will. Which once again makes you lose brake force.

My suggestion is to
replace the caliper
flush your brake fluid COMPLETELY
This can be done with a mighty vac or having one person pump the pedal while the other loosens the bleed port. The second one will take a while.


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Posts in this topic
- Vince-Noir   Retracting Caliper Pistons   Feb 25, 2008 - 1:14 PM
- - playr158   get a c-clamp and compress them back in... or put...   Feb 25, 2008 - 1:22 PM
- - LewFX   c-clamp with the old pad still on the piston so yo...   Feb 25, 2008 - 1:29 PM
- - Vince-Noir   Thanks guys, i had a crack using the old pad to he...   Feb 25, 2008 - 2:10 PM
|- - njccmd2002   QUOTE(Vince-Noir @ Feb 25, 2008 - 2...   Feb 25, 2008 - 2:43 PM
- - Vince-Noir   Yeah, i've had the cap off since i got it jack...   Feb 25, 2008 - 2:55 PM
- - D-Man   Woah, that dont sound good at all... It leaked ou...   Feb 25, 2008 - 3:16 PM
- - hongkongnerdboy   well i got nothing on the fluid leaking.. just hav...   Feb 25, 2008 - 4:37 PM
- - alltracman78   Two problems. 1-When you pushed the piston back i...   Feb 25, 2008 - 7:56 PM
- - 6strngs   sounds like you blew the seal on the caliper pisto...   Feb 26, 2008 - 2:25 AM
- - Vince-Noir   Ok thanks for all your help guys, appreciate it...   Feb 26, 2008 - 8:22 AM
- - malecrod   From my personal experience, I will advice you to ...   Feb 26, 2008 - 10:40 AM
- - Vince-Noir   Ok took the GT into my local trusted garage yester...   Feb 27, 2008 - 7:01 AM
- - alltracman78   If the cap was only off for a few hours it shouldn...   Feb 27, 2008 - 12:39 PM
- - Vince-Noir   Thanks altracman78, i should have made the facts m...   Feb 27, 2008 - 2:54 PM
- - alltracman78   No worries Damn, I live right next to Wrentham ...   Feb 27, 2008 - 7:18 PM
- - Vince-Noir   Franklin Street! Very random indeed, can't...   Feb 27, 2008 - 7:40 PM


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